It's been quite a while since I've had something Frugal worthy to post, so until a couple of other bubbling posts come to full boil I thought I'd best at least make a quick post.
One key factor it this project was that it had to be quick. I've a Warmachine Battle box needing to be painted and if this stalled I knew it would sit half fininshed for a while. Also I don't play RSBS that often so it is a bit of a luxury piece. So detail level is accordingly set to "background".
The arena is open down one side. I'd prefer a completely enclosed area but there you go. Access to the figures would be easier are a result - no disaster. The actual battle floor is eliptical and 18" x 13" at the widest point. Smaller that the recommended 2"x 2" area in the ruleset, but it 1-on-1 battles (ie the vast majority of the time) it shouldn't make much difference. You can see two 28mm Foundry Gladiators in the bare arena here.